I'm having this small issue since last September, and based on "behaviour" observation on startup, I more or less suspect avast! Free but I'm definitely not sure.

9 times out of 10, my Wifi connection displays the message "non-existent or partially limited" and it looks like it's waiting for some avast's process to launch/activate properly.After a minute or two, the connection sometimes reinitialize by itself and connect automatically to the hub, but I generally have to disconnect/reconnect manually to get a full connection. After that, no more problem.